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nevsk [136]
3 years ago
9

Two parts of the food chain are described below:

Chemistry
2 answers:
weqwewe [10]3 years ago
6 0

Answer:

the answer is a

SVETLANKA909090 [29]3 years ago
5 0

Answer:

A: part 1 consumers, part 2 the sun

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Element 2 is:<br> A) Cobalt<br> B)Chlorine <br> C)Calcium<br> D)Carbon
saul85 [17]

Answer:

D: Carbon

Explanation:

Carbon is the sixth element with a total of 6 electrons in the periodic table. Hence the atomic number Z = 6. The ground state electron configuration of carbon is 1s2 2s2 2p2. An excited state electron configuration of carbon is 1s2 2s1 2p3.

4 0
3 years ago
A boy with pneumonia has lungs with a volume of 1.7 L that fill with 0.070 mol of air when he inhales. When he exhales, his lung
BlackZzzverrR [31]

Answer:

0.053moles

Explanation:

Hello,

To calculate the number of moles of gas remaining in his after he exhale, we'll have to use Avogadro's law which states that the volume of a given mass of gas is directly proportional to its number of moles provided that temperature and pressure are kept constant. Mathematically,

V = kN, k = V / N

V1 / N1 = V2 / N2= V3 / N3 = Vx / Nx

V1 = 1.7L

N1 = 0.070mol

V2 = 1.3L

N2 = ?

From the above equation,

V1 / N1 = V2 / N2

Make N2 the subject of formula

N2 = (N1 × V2) / V1

N2 = (0.07 × 1.3) / 1.7

N2 = 0.053mol

The number of moles of gas in his lungs when he exhale is 0.053 moles

7 0
3 years ago
The same chemistry student has a weight of 155lbs what is the student weight in grams
Brrunno [24]

the answer is 70306.8 grams

6 0
3 years ago
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Which of the following is not true of atoms?
Alexandra [31]

Answer:

they are composed of water

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All of the following are indicators of chemical change except…
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D. All of the above are indicators of chemical change
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